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You have plenty of signal in the air... but not excessive levels. The trees can account for reception reliability problems. Moving limbs and foliage will cause signal levels to change rapidly, making the tuner loose lock on the data stream.
One could also speculate that there is a source of interference in the area.
I'd have used a more directional antenna to combat some of the effects of foliage, multi-path and interference.
The Winegard HD7694P and Antennacraft HBU-33 come to mind.
Before you give up on the existing antenna, consider purchasing a new, factory built cable assembly, 50' or less in length. I would use it to bypass all the existing cable, so that you can test just the antenna connected to one TV. The test setup can be run temporarily, even through an open door or window. While testing, be sure to try alternate aim and position of the antenna. If you can't find a reliable position for the antenna, I'd then consider stepping up to a more directional antenna.
If you do replace the existing antenna, I'd not expect you to need any amplification, though if the need was proven, a distribution amplifier can be added at any time.
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If the well is dry and you don't see rain on the horizon, you'll need to dig the hole deeper. (If the antenna can't get the job done, an amp won't fix it.)
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